CN112098739B - Battery pack short-circuit protection test circuit, circuit board and test equipment - Google Patents
Battery pack short-circuit protection test circuit, circuit board and test equipment Download PDFInfo
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- CN112098739B CN112098739B CN202010464086.9A CN202010464086A CN112098739B CN 112098739 B CN112098739 B CN 112098739B CN 202010464086 A CN202010464086 A CN 202010464086A CN 112098739 B CN112098739 B CN 112098739B
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- 238000012360 testing method Methods 0.000 title claims abstract description 56
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000000977 initiatory effect Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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Abstract
The embodiment of the invention discloses a battery pack short-circuit protection test circuit, a circuit board and test equipment, wherein the circuit comprises: the circuit comprises a control chip, a driving circuit, a short circuit control circuit, a short circuit delay circuit and a short circuit starting circuit; the positive electrode end of the short-circuit control circuit is used for being connected with the positive electrode of the battery pack, and the negative electrode end of the short-circuit control circuit is used for being connected with the negative electrode of the battery pack; the negative electrode end of the short-circuit control circuit is used for connecting the negative electrode of the battery pack; the short circuit starting circuit comprises a first short circuit starting unit and a second short circuit starting unit; when the control chip receives a first short-circuit starting signal sent by the first short-circuit starting unit or receives a second short-circuit starting signal sent by the second short-circuit starting unit, the control chip drives the short-circuit control circuit through the driving circuit, so that the positive electrode end and the negative electrode end are short-circuited in short-circuit time corresponding to the short-circuit starting signal. According to the technical scheme, the battery pack is effectively prevented from being damaged by short circuit test, the test time is shortened, and the test difficulty is reduced.
Description
Technical Field
The invention relates to the field of short circuit testing of battery packs, in particular to a short circuit protection testing circuit, a circuit board and testing equipment of a battery pack.
Background
In recent years, as lithium batteries are popularized and used in products in the household field, the lithium BATTERY industry is accelerated to develop more rapidly, and as explosion and ignition occur in the case of overcharge and short circuit of the lithium batteries, a BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS) needs to be added to effectively protect the lithium batteries.
The existing short-circuit protection test of the battery management system of the lithium battery comprises a short-circuit test of a small-capacity battery pack and a short-circuit test of a large-capacity battery pack, wherein the short-circuit test of the small-capacity battery pack is artificial direct short-circuit, and the short-circuit test of the large-capacity battery pack is performed by using a large-scale instrument. An artificial direct short circuit can have a large spark and it is assumed that failure can directly cause the battery management system to fail and fire. The large instrument cannot accurately reach the mu S, mS level time, the short circuit time of 1S can be set at minimum, the short circuit is disconnected after 1S to realize protection, the large instrument is high in price, a special laboratory is required to be equipped, and protection failure can also cause damage to the protection board and fire.
Disclosure of Invention
In view of the above, the present invention provides a battery pack short-circuit protection test circuit, a circuit board, and a test apparatus.
One embodiment of the present invention provides a battery pack short-circuit protection test circuit, which includes: the circuit comprises a control chip, a driving circuit, a short circuit control circuit, a short circuit delay circuit and a short circuit starting circuit;
the positive electrode end of the short circuit control circuit is used for being connected with the positive electrode of the battery pack, and the negative electrode end of the short circuit control circuit is used for being connected with the negative electrode of the battery pack;
the short circuit starting circuit comprises a first short circuit starting unit and a second short circuit starting unit;
when the control chip receives a first short-circuit starting signal sent by the first short-circuit starting unit, the control chip drives the short-circuit control circuit through the driving circuit, so that the positive terminal and the negative terminal are short-circuited in a short-circuit time determined according to a short-circuit delay signal of the short-circuit delay circuit;
when the control chip receives a second short-circuit starting signal sent by the second short-circuit starting unit, the control chip drives the short-circuit control circuit through the driving circuit, so that the positive electrode terminal and the negative electrode terminal are short-circuited in a short-circuit time corresponding to the second short-circuit starting signal.
The control chip determines the short circuit time according to the short circuit delay signal of the short circuit delay circuit, and comprises the following steps:
the short-circuit delay circuit comprises delay switches, and the number of the delay switches is a preset number;
each delay switch is used for correspondingly controlling the grounding of a receiving pin of a short-circuit delay signal of the control chip or connecting the receiving pin with the power end of the control chip;
and the control chip determines the short circuit time according to the grounding or power end connecting condition of each short circuit delay signal receiving pin.
The battery pack short-circuit protection test circuit further comprises:
the short circuit starting circuit further comprises a third short circuit starting unit;
when the control chip receives a third short circuit starting signal sent by the third short circuit starting unit, the positive electrode end and the negative electrode end of the short circuit control circuit are in short circuit;
when the third short circuit starting signal disappears, the positive electrode end and the negative electrode end of the short circuit control circuit are disconnected.
Each short-circuit starting unit of the short-circuit starting circuit comprises a starting switch;
each starting switch is used for correspondingly controlling a receiving pin of a short circuit starting signal of the control chip to be grounded or connected with a power end of the control chip.
The driving circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first triode, a second triode, a third triode and a diode;
one end of the first resistor is connected with the driving pin of the control chip, the other end of the first resistor is respectively connected with the first end of the first triode and one end of the second resistor, and the third end of the first triode and the other end of the second resistor are grounded;
the second end of the first triode is connected with one end of the third resistor, the other end of the third resistor is respectively connected with a power supply end and the anode of the diode, the cathode of the diode is connected with the second end of the second triode, and the first end of the second triode is connected with the second end of the first triode;
the third end of the second triode is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the voltage receiving end of the short-circuit control circuit and is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the third end of the third triode;
the first end of the third triode is respectively connected with the first end of the second triode and one end of the sixth resistor, and the other end of the sixth resistor and the second end of the third triode are grounded.
The short circuit control circuit comprises n switching tubes, n protection resistors, k voltage stabilizing tubes, a seventh resistor, an eighth resistor and a capacitor, wherein the n protection resistors, the k voltage stabilizing tubes, the seventh resistor, the eighth resistor and the capacitor are in one-to-one correspondence with the n switching tubes, and the n and the k are set according to test conditions;
the first ends of the switching tubes are connected with one end of the corresponding protection resistor, and the other ends of the n protection resistors are connected with each other to serve as voltage receiving ends of the short circuit control circuit;
the second ends of the n switching tubes, the cathodes of the k voltage stabilizing tubes and one end of the capacitor are connected with each other and serve as the positive electrode end;
the third ends of the n switching tubes are connected with the anodes of the k voltage stabilizing tubes and the other ends of the capacitors;
one end of the seventh resistor is connected with the voltage receiving end of the short circuit control circuit, the other end of the seventh resistor is connected with the third ends of the n switching tubes and serves as the negative electrode end, and the negative electrode end is grounded through an eighth resistor.
The battery pack short-circuit protection test circuit provided by the other embodiment of the invention further comprises a voltage conversion circuit and a power supply circuit, wherein the power supply end of the voltage conversion circuit is connected with the power supply end of the power supply circuit, the voltage output end of the voltage conversion circuit is connected with the power supply end of the control chip, the voltage conversion circuit is used for converting the voltage provided by the power supply circuit into the standard working voltage of the control chip, and the power supply end is also used for providing voltage for the driving circuit.
The battery pack short-circuit protection test circuit further comprises a voltage display circuit and a power supply circuit, wherein the power supply end of the voltage display circuit is connected with the power supply end of the power supply circuit, the positive electrode end of the voltage display circuit is connected with the positive electrode end of the short-circuit control circuit, the negative electrode end of the voltage display circuit is connected with the negative electrode end of the short-circuit control circuit, and the voltage display circuit is used for displaying the short-circuit voltage.
The above embodiment relates to a circuit board including the battery pack short-circuit protection test circuit described in the above embodiment.
The above embodiments relate to a test apparatus comprising the above circuit board.
The battery pack short-circuit test circuit provided by the invention can set the short-circuit time of mu S and mS levels, effectively ensures that the short-circuit time set by the short-circuit test circuit is smaller than the short-circuit protection time of the battery pack, can construct a simple and safe test environment for the short-circuit test of the battery pack, and avoids the condition that a battery management system is damaged and fires. The positive electrode P+ and the negative electrode P-of the battery pack are connected into a short-circuit protection test circuit, the short-circuit time delay circuit is used for setting short-circuit time larger than the short-circuit time designed by the battery management system according to the short-circuit time designed by the battery management system, and after the control chip acquires a short-circuit starting signal, the positive electrode P+ end and the negative electrode P-of the short-circuit control circuit are short-circuited so as to ensure the short-circuit protection of the battery pack. If the battery pack is in short-circuit protection failure, after the short-circuit time set by the short-circuit delay circuit is exceeded, the control chip controls the positive electrode end P+ and the negative electrode end P-of the short-circuit control circuit to be disconnected, so that personal safety caused by fire explosion of the battery pack due to continuous short circuit is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are required for the embodiments will be briefly described, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope of the present invention. Like elements are numbered alike in the various figures.
Fig. 1 shows a schematic structural diagram of a short-circuit protection test circuit according to an embodiment of the present invention;
fig. 2 shows a schematic circuit diagram of a driving circuit and a short-circuit control circuit of a short-circuit protection test circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another short-circuit protection test circuit according to an embodiment of the present invention.
Description of main reference numerals:
10-a control chip; 20-a short-circuit starting circuit; 30-short-circuit delay circuit; 40-a driving circuit; 50-a short circuit control circuit; a 60-voltage conversion circuit; a 70-voltage display circuit; 80-a power supply circuit; r1-a first resistor; r2-a second resistor; r3-a third resistor; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; q1-a first triode; q2-a second triode; q3-a third triode; d1-a diode; r7-seventh resistor; r8-eighth resistor; c1-capacitance.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
The terms "comprises," "comprising," "including," or any other variation thereof, are intended to cover a specific feature, number, step, operation, element, component, or combination of the foregoing, which may be used in various embodiments of the present invention, and are not intended to first exclude the presence of or increase the likelihood of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the invention belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in connection with the various embodiments of the invention.
Example 1
Referring to fig. 1, a battery pack short-circuit protection test circuit is shown, the circuit comprising: a control chip 10, a driving circuit 40, a short circuit control circuit 50, a short circuit delay circuit 30 and a short circuit start circuit 20.
The positive end of the short-circuit control circuit 50 is used for connecting the positive electrode of the battery pack, and the negative end of the short-circuit control circuit 50 is used for connecting the negative electrode of the battery pack;
the short starting circuit 20 includes a first short starting unit and a second short starting unit; when the control chip 10 receives a first short-circuit starting signal sent by the first short-circuit starting unit, the control chip 10 drives the short-circuit control circuit 50 through the driving circuit 40, so that the positive electrode terminal and the negative electrode terminal are short-circuited in a short-circuit time determined according to a short-circuit delay signal of the short-circuit delay circuit 30; when the control chip 10 receives the second short-circuit start signal sent by the second short-circuit start unit, the control chip drives the short-circuit control circuit 50 through the driving circuit 40, so that the positive electrode terminal and the negative electrode terminal are short-circuited in the short-circuit time corresponding to the second short-circuit start signal.
Further, the short-circuit delay circuit 30 includes delay switches, the number of the delay switches is a preset number, each delay switch is used for correspondingly controlling the grounding of a receiving pin of a short-circuit delay signal of the control chip 10 or the connection of the receiving pin of the short-circuit delay signal to the power supply terminal of the control chip 10, and the control chip 10 determines the short-circuit time according to the grounding or connection of each receiving pin of the short-circuit delay signal to the power supply terminal.
For example, if the number of the preset delay switches is 3, the preset delay switches are marked as number 1, number 2 and number 3, and if the receiving pin of the short-circuit delay signal correspondingly controlled by the delay switch is grounded, the receiving pin of the short-circuit delay signal receives a low level, which can be marked as 0; if the receiving pin of the short-circuit delay signal correspondingly controlled by the delay switch is connected with the power end of the control chip 10, the receiving pin of the short-circuit delay signal receives a high level, which can be recorded as 1. The receiving pins of the three short-circuit delay signals of the control chip 10 can determine the short-circuit time according to the obtained high level and low level, i.e., the pins are 0 or 1. The relationship between the short-circuit time and the short-circuit delay signal corresponding to each delay switch can be seen in the following table.
Further, each short starting unit of the short starting circuit 20 includes a starting switch; each start switch is used for grounding a receiving pin of a short circuit start signal corresponding to the control chip 10 or connecting the receiving pin with a power end of the control chip 10.
The short circuit start circuit 20 may include 3 start switches, denoted as 11, 22 and 33, and the 3 start switches correspond to the receiving pins of the 3 short circuit start signals of the control chip 10.
For example, when the receiving pin of the short circuit start signal corresponding to the control chip 10 is connected to the power end of the control chip 10, and the receiving pins of the short circuit start signals corresponding to the control chip 10 are grounded, the receiving pins of the short circuit start signals receive the first short circuit start signal, and the control chip 10 can determine the short circuit time according to the short circuit delay signals corresponding to the delay switches. For example, if 3 delay switches ground 3 pins of the control chip 10, and the 3 pins receive low level, and record as 0, the short-circuit time is 200 μs by referring to the relationship table of the short-circuit time and the short-circuit delay signals corresponding to the delay switches. The control chip 10 controls the driving circuit 40 to output a short-circuit voltage when receiving the first short-circuit start signal, and controls the positive electrode terminal and the negative electrode terminal of the short-circuit control circuit 50 to be short-circuited when the short-circuit control circuit 50 receives the short-circuit voltage, so that the battery pack is disconnected after 200 mu S short-circuited is executed.
For example, when the receiving pin of the other short circuit start signal corresponding to the control chip 10 of the No. 22 start switch is connected to the power end of the control chip 10, and the receiving pins of the short circuit start signals corresponding to the No. 11 start switch and the No. 33 start switch are grounded, the receiving pin of the short circuit start signal receives the second short circuit start signal, and the control chip 10 determines the short circuit time according to the preset time. For example, if the preset time is 30S, the control chip 10 controls the driving circuit 40 to output the short-circuit voltage when receiving the second short-circuit start signal, and controls the positive electrode terminal and the negative electrode terminal of the short-circuit control circuit 50 to be short-circuited when the short-circuit control circuit 50 receives the short-circuit voltage, so that the battery pack is disconnected after 30S short-circuiting is performed.
For example, when the receiving pin of a short circuit start signal corresponding to the 33 # start switch is connected to the power end of the control chip 10, and the receiving pins of short circuit start signals corresponding to the 11 # start switch and the 22 # start switch are grounded, the receiving pin of the short circuit start signal receives the third short circuit start signal, and controls the short circuit between the positive end and the negative end of the short circuit control circuit 50; when the third short circuit start signal disappears, that is, the receiving pin of the short circuit start signal corresponding to the 33 # start switch control chip 10 is grounded, the positive terminal and the negative terminal of the short circuit control circuit 50 are disconnected.
Further, referring to fig. 2, the driving circuit 40 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first transistor Q1, a second transistor Q2, a third transistor Q3, and a diode D1.
One end of the first resistor R1 is connected with a driving pin of the control chip 10, the other end of the first resistor R1 is respectively connected with a first end of the first triode Q1 and one end of the second resistor R2, and a third end of the first triode Q1 and the other end of the second resistor R2 are grounded; the second end of the first triode Q1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with a power supply end and the positive electrode of a diode D1, the negative electrode of the diode D1 is connected with the second end of a second triode Q2, and the first end of the second triode Q2 is connected with the second end of the first triode Q1; the third end of the second triode Q2 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with the voltage receiving end of the short-circuit control circuit 50 and is connected with one end of a fifth resistor R5, and the other end of the fifth resistor R5 is connected with the third end of the third triode Q3; the first end of the third triode Q3 is respectively connected with the first end of the second triode Q2 and one end of a sixth resistor R6, and the other end of the sixth resistor R6 and the second end of the third triode Q3 are grounded.
The driving circuit 40 adopts a push-pull driving circuit 40 in an up-down pair transistor mode, which is different from a common push-pull circuit, and the output voltage of the common push-pull circuit can be clamped to VCC (5V) -0.7V of the singlechip during high level, so that the voltage of the driving MOS becomes smaller and the internal resistance becomes larger. The output voltage of the driving circuit 40 may be B16V.
And B16V is positive pole P+ (12V-16.8V) of a 4-string 1-parallel battery pack, and the battery pack is provided with a protection circuit board for protecting the battery cells. When the driving pin of the control chip 10 outputs a low level, the B16V voltage received by the driving circuit 40 is passed through the third resistor R3 to the second transistor Q2 and the third transistor Q3, the third transistor Q3 is turned off, the second transistor Q2 is turned on, and the short-circuit voltage output terminal outputs a short-circuit voltage. When the driving pin of the control chip 10 outputs a high level, the first triode Q1 is turned on, the B16V voltage is pulled to ground by the first triode Q1 after passing through the third resistor R3 to the second triode Q2 and the third triode Q3, the second triode Q2 is turned off, the third triode Q3 is turned on, and the short-circuit voltage output terminal is pulled to ground to output a low level.
Further, referring to fig. 2, the short circuit control circuit 50 includes n switching transistors, and n protection resistors, k voltage stabilizing transistors, a seventh resistor R7, an eighth resistor R8, and a capacitor C1, n, and k, which are in one-to-one correspondence with the n switching transistors, are set according to the test conditions.
The first end of each switch tube is connected with one end of a corresponding protection resistor, and the other ends of the n protection resistors are mutually connected to serve as voltage receiving ends of the short circuit control circuit 50; the second ends of the n switching tubes, the cathodes of the k voltage stabilizing tubes and one end of the capacitor C1 are connected with each other and serve as positive ends; the third ends of the n switching tubes are connected with the anodes of the k voltage stabilizing tubes and the other ends of the capacitors C1; one end of the seventh resistor R7 is connected to the voltage receiving end of the short circuit control circuit 50, the other end of the seventh resistor R7 is connected to the third ends of the n switching tubes, and the negative end is grounded through the eighth resistor R8.
After the control chip 10 receives the short-circuit start signal, the control chip 10 controls the driving circuit 40 to output a short-circuit voltage, namely, B16V voltage (12V-16.8V), n switching tubes are conducted, the positive electrode terminal P+ and the negative electrode terminal P-of the short-circuit control circuit 50 are short-circuited, after the short-circuit time is reached, the short-circuit voltage terminal output by the driving circuit 40 is pulled to the ground, the n switching tubes are cut off, the positive electrode terminal P+ and the negative electrode terminal P-of the short-circuit control circuit 50 are disconnected, and peak voltage generated at the moment of disconnection is absorbed by k voltage stabilizing tubes. The n switching tubes are selected to be high in withstand voltage and low in internal resistance.
For example, n may be 10, and the internal resistance of the 10 switching tubes combined is very small, which is negligible for the entire short circuit control circuit 50. The switching tube can generate large peak voltage at the switching-off moment, the larger the current is, the larger the peak energy is, and the high voltage of the battery is overlapped, so that the instant peak exceeds the voltage withstand value of the switching tube to damage the switching tube, the voltage stabilizing tube needs to be added to absorb the peak voltage, and k is preferably 15. The n and k can be set according to the test requirements.
The battery pack short-circuit test circuit provided by the embodiment can set the short-circuit time of mu S and mS levels, effectively ensures that the short-circuit time set by the short-circuit test circuit is smaller than the short-circuit protection time of the battery pack, can construct a simple and safe test environment for the short-circuit test of the battery pack, and avoids the condition that a battery management system is damaged and fires. The positive electrode P+ and the negative electrode P-of the battery pack are connected into a short-circuit protection test circuit, the short-circuit time delay circuit 30 is used for setting the short-circuit time larger than the short-circuit time designed by the battery management system according to the short-circuit time designed by the battery management system, and after the control chip 10 acquires a short-circuit starting signal, the positive electrode P+ end and the negative electrode P-of the short-circuit control circuit 50 are short-circuited so as to ensure the short-circuit protection of the battery pack. If the battery pack short-circuit protection fails, after exceeding the short-circuit time set by the short-circuit delay circuit 30, the control chip 10 controls the positive electrode terminal p+ and the negative electrode terminal P-of the short-circuit control circuit 50 to be disconnected, so that personal safety caused by fire explosion of the battery pack due to continuous short circuit is avoided.
Example 2
In this embodiment, referring to fig. 3, the illustrated battery pack short-circuit protection test circuit further includes a voltage conversion circuit 60 and a power supply circuit 80, where a power supply terminal of the voltage conversion circuit 60 is connected to a power supply terminal of the power supply circuit 80, a voltage output terminal of the voltage conversion circuit 60 is connected to a power supply terminal of the control chip 10, and the voltage conversion circuit 60 is configured to convert a voltage provided by the power supply circuit 80 into a standard operating voltage of the control chip 10, and the power supply terminal is further configured to provide a voltage to the driving circuit.
Further, the battery pack short-circuit protection test circuit further comprises a voltage display circuit 70 and a power supply circuit 80, wherein a power supply end of the voltage display circuit 70 is connected with a power supply end of the power supply circuit 80, a positive end of the voltage display circuit 70 is connected with a positive end of the short-circuit control circuit 50, a negative end of the voltage display circuit 70 is connected with a negative end of the short-circuit control circuit 50, and the voltage display circuit 70 is used for displaying the short-circuit voltage.
The voltage display circuit 70 includes a voltage display screen, and by observing the voltage display screen, it can be judged whether or not the short-circuit protection is effective. For example, if the voltage display screen displays the battery voltage, the short-circuit protection to the battery pack fails; if the voltage display screen displays small voltage, the short-circuit protection of the battery pack is normal.
It should be appreciated that the above embodiments relate to a circuit board including the battery pack short-circuit protection test circuit of the above embodiments.
It should be appreciated that the above embodiments relate to a test apparatus comprising a circuit board as described above.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners as well. The apparatus embodiments described above are merely illustrative, for example, of the flow diagrams and block diagrams in the figures, which illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules or units in various embodiments of the invention may be integrated together to form a single part, or the modules may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a smart phone, a personal computer, a server, a network device, or the like) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely illustrative embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention should be covered.
Claims (9)
1. A battery pack short-circuit protection test circuit, comprising: the circuit comprises a control chip, a driving circuit, a short circuit control circuit, a short circuit delay circuit and a short circuit starting circuit;
the positive electrode end of the short circuit control circuit is used for being connected with the positive electrode of the battery pack, and the negative electrode end of the short circuit control circuit is used for being connected with the negative electrode of the battery pack;
the short circuit starting circuit comprises a first short circuit starting unit and a second short circuit starting unit;
when the control chip receives a first short-circuit starting signal sent by the first short-circuit starting unit, the control chip drives the short-circuit control circuit through the driving circuit, so that the positive terminal and the negative terminal are short-circuited in a short-circuit time determined according to a short-circuit delay signal of the short-circuit delay circuit;
when the control chip receives a second short-circuit starting signal sent by the second short-circuit starting unit, the control chip drives the short-circuit control circuit through the driving circuit, so that the positive electrode terminal and the negative electrode terminal are short-circuited in a short-circuit time corresponding to the second short-circuit starting signal; the short-circuit time is smaller than the short-circuit protection time of the battery pack, and if the short-circuit protection of the battery pack fails, after exceeding the short-circuit time set by the short-circuit delay circuit, the control chip controls the positive electrode end P+ and the negative electrode end P-of the short-circuit control circuit to be disconnected;
the short circuit control circuit comprises n switching tubes, n protection resistors, k voltage stabilizing tubes, a seventh resistor, an eighth resistor and a capacitor, wherein the n protection resistors, the k voltage stabilizing tubes, the seventh resistor, the eighth resistor and the capacitor are in one-to-one correspondence with the n switching tubes, and the n and the k are set according to test conditions;
the base electrodes of the switching tubes are connected with one end of the corresponding protection resistor, and the other ends of the n protection resistors are connected with each other to serve as voltage receiving ends of the short circuit control circuit;
the collector electrodes of the n switching tubes, the negative electrodes of the k voltage stabilizing tubes and one end of the capacitor are connected with each other and serve as the positive electrode end;
the emitters of the n switching tubes are connected with the anodes of the k voltage stabilizing tubes and the other ends of the capacitors;
one end of the seventh resistor is connected with the voltage receiving end of the short circuit control circuit, the other end of the seventh resistor is connected with the emitters of the n switching tubes and serves as the negative electrode end, and the negative electrode end is grounded through an eighth resistor.
2. The battery pack short-circuit protection test circuit according to claim 1, wherein the control chip determines a short-circuit time according to a short-circuit delay signal of the short-circuit delay circuit, comprising:
the short-circuit delay circuit comprises delay switches, and the number of the delay switches is a preset number;
each delay switch is used for correspondingly controlling the grounding of a receiving pin of a short-circuit delay signal of the control chip or connecting the receiving pin with the power end of the control chip;
and the control chip determines the short circuit time according to the grounding or power end connecting condition of each short circuit delay signal receiving pin.
3. The battery pack short-circuit protection test circuit of claim 1, further comprising:
the short circuit starting circuit further comprises a third short circuit starting unit;
when the control chip receives a third short circuit starting signal sent by the third short circuit starting unit, the positive electrode end and the negative electrode end of the short circuit control circuit are in short circuit;
when the third short circuit starting signal disappears, the positive electrode end and the negative electrode end of the short circuit control circuit are disconnected.
4. The battery pack short circuit protection test circuit of claim 3, wherein each short circuit initiation unit of the short circuit initiation circuit comprises an initiation switch;
each starting switch is used for correspondingly controlling a receiving pin of a short circuit starting signal of the control chip to be grounded or connected with a power end of the control chip.
5. The battery pack short-circuit protection test circuit according to claim 1, wherein the driving circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first triode, a second triode, a third triode, and a diode;
one end of the first resistor is connected with a driving pin of the control chip, the other end of the first resistor is respectively connected with a base electrode of the first triode and one end of the second resistor, and an emitting electrode of the first triode and the other end of the second resistor are grounded;
the collector electrode of the first triode is connected with one end of the third resistor, the other end of the third resistor is respectively connected with a power supply end and the anode of the diode, the cathode of the diode is connected with the collector electrode of the second triode, and the base electrode of the second triode is connected with the collector electrode of the first triode;
the emitter of the second triode is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the voltage receiving end of the short-circuit control circuit and is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the collector of the third triode;
the base electrode of the third triode is respectively connected with the base electrode of the second triode and one end of the sixth resistor, and the other end of the sixth resistor and the emitter electrode of the third triode are grounded.
6. The battery pack short-circuit protection test circuit according to any one of claims 1 to 5, further comprising a voltage conversion circuit and a power supply circuit, wherein a power supply terminal of the voltage conversion circuit is connected to a power supply terminal of the power supply circuit, a voltage output terminal of the voltage conversion circuit is connected to a power supply terminal of the control chip, the voltage conversion circuit is configured to convert a voltage provided by the power supply circuit into a standard operating voltage of the control chip, and the power supply terminal is further configured to provide a voltage to the driving circuit.
7. The battery pack short-circuit protection test circuit according to any one of claims 1 to 5, further comprising a voltage display circuit and a power supply circuit, wherein a power supply terminal of the voltage display circuit is connected to a power supply terminal of the power supply circuit, a positive terminal of the voltage display circuit is connected to a positive terminal of the short-circuit control circuit, a negative terminal of the voltage display circuit is connected to a negative terminal of the short-circuit control circuit, and the voltage display circuit is used for displaying a magnitude of a short-circuit voltage.
8. A circuit board comprising the battery pack short-circuit protection test circuit of any one of claims 1 to 7.
9. A test apparatus comprising the circuit board of claim 8.
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| CN202010464086.9A CN112098739B (en) | 2020-05-27 | 2020-05-27 | Battery pack short-circuit protection test circuit, circuit board and test equipment |
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| CN202010464086.9A CN112098739B (en) | 2020-05-27 | 2020-05-27 | Battery pack short-circuit protection test circuit, circuit board and test equipment |
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| CN112098739B true CN112098739B (en) | 2024-02-23 |
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| CN112098739A (en) | 2020-12-18 |
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